Toxic effects of dietary of Al3+ ions in tilapias (Oreochromis niloticus) and protective effect of Zn2+ ion |
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Authors: | Lídia Brizola Santos Elias Basile Tambourgi Vitor de Cinque Almeida |
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Affiliation: | 1. Departamento de Química , Universidade Estadual de Maringá – UEM , Av. Colombo, 5790, Maringá , PR , Brazil;2. Faculdade de Engenharia Química, Departamento de Engenharia de Sistemas Químicos , Universidade Estadual de Campinas – UNICAMP , Av. Albert Einstein, 500, Cidade Universitária, Campinas , SP , Brazil |
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Abstract: | The lethal effects of aluminum ion (Al3+) in tilapia (Oreochromis niloticus) raised in concrete tanks were investigated. Tilapias were fed daily with commercial feed enriched with known concentrations of Al3+ and analyzed by differential pulse anodic stripping voltammetry (DPASV). The concentrations of Al3+ in feces, water, muscle tissue, viscera, and heads were determined every 3 months for a period of 365 days. The Tilapia head was the most affected tissue by Al3+. In general, Al3+ bioaccumulation reached the lethal dose (LD50) after 335 days of experiment as follows: 34.9?mg?kg?1 (muscle tissue), 88.2?mg?kg?1 (viscera), and 126.9?mg?kg?1 (head without gills). After determining Cu2+, Zn2+, and Ca2+ by absorption spectrometry, a decrease in the Ca2+ concentration was noted in the head during the experimental period. These observations were associated with the occurrence of a decalcification in the bone tissue in the presence of Al3+. In contrast, it was found that Zn2+ ions may act as a protective agent against Al3+-induced contamination. |
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Keywords: | tilapia toxicity lethal dose protective agent |
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